Assorted, random things that you may want to avoid in order to have an optimal experience with PCB:NG. Check back as we add more to this list.
Outlines on every layer
Here's an example of a great outline layer:
Unfortunately, too much of a good thing is not a good thing. It's also present in the top copper...
...and the bottom copper...
...and every other layer. Our DFM is likely to reject such jobs. Please take care to ensure you avoid this.
Don't Use Package Outlines as Land Patterns
The blue pads are an example of a correct land pattern for a QFN-88:
Here's an example of what not to do - pads shown in orange:
More detail on the PCB:NG blog.